/* Erdos-Renyi : G(n,M)
*/
igraph_t *ggen_generate_erdos_gnm(gsl_rng *r, unsigned long n, unsigned long m)
{
igraph_matrix_t adj;
igraph_t *g = NULL;
int err;
unsigned long i,j;
unsigned long added_edges = 0;
ggen_error_start_stack();
if(r == NULL)
GGEN_SET_ERRNO(GGEN_EINVAL);
if(m > (n*(n-1)/2))
GGEN_SET_ERRNO(GGEN_EINVAL);
g = malloc(sizeof(igraph_t));
GGEN_CHECK_ALLOC(g);
GGEN_FINALLY3(free,g,1);
if(m == 0 || n <= 1)
{
GGEN_CHECK_IGRAPH(igraph_empty(g,n,1));
goto end;
}
if(m == (n*(n-1))/2)
{
GGEN_CHECK_IGRAPH(igraph_full_citation(g,n,1));
goto end;
}
GGEN_CHECK_IGRAPH(igraph_matrix_init(&adj,n,n));
GGEN_FINALLY(igraph_matrix_destroy,&adj);
igraph_matrix_null(&adj);
while(added_edges < m) {
GGEN_CHECK_GSL_DO(i = gsl_rng_uniform_int(r,n));
GGEN_CHECK_GSL_DO(j = gsl_rng_uniform_int(r,n));
if(i < j && igraph_matrix_e(&adj,i,j) == 0)
{
igraph_matrix_set(&adj,i,j,1);
added_edges++;
}
}
GGEN_CHECK_IGRAPH(igraph_adjacency(g,&adj,IGRAPH_ADJ_DIRECTED));
end:
ggen_error_clean(1);
return g;
ggen_error_label:
return NULL;
}
int main() {
igraph_matrix_t m, m2;
igraph_vector_t v;
long int i, j, i2, j2;
igraph_real_t r1, r2;
igraph_matrix_init(&m, 4, 3);
byrow(&m);
/* igraph_matrix_e */
printf("igraph_matrix_e\n");
apply(m, printf("%i ", (int)igraph_matrix_e(&m, i, j)), printf("\n"));
/* igraph_matrix_e_ptr */
printf("igraph_matrix_e_ptr\n");
apply(m, printf("%i ", (int)igraph_matrix_e_ptr(&m, i, j)[0]), printf("\n"));
/* igraph_matrix_set */
printf("igraph_matrix_set\n");
apply(m, igraph_matrix_set(&m, i, j, i), (void) 0 );
print_matrix(&m);
apply(m, igraph_matrix_set(&m, i, j, j), (void) 0 );
print_matrix(&m);
/* igraph_matrix_fill */
printf("igraph_matrix_fill\n");
igraph_matrix_fill(&m, 42);
print_matrix(&m);
igraph_matrix_fill(&m, -42.1);
print_matrix(&m);
/* igraph_matrix_update */
printf("igraph_matrix_update\n");
igraph_matrix_init(&m2, 0, 0);
byrow(&m);
igraph_matrix_update(&m2, &m);
print_matrix(&m2);
/* igraph_matrix_rbind */
printf("igraph_matrix_rbind\n");
igraph_matrix_rbind(&m2, &m);
print_matrix(&m2);
printf("\n");
igraph_matrix_resize(&m, 0, igraph_matrix_ncol(&m2));
igraph_matrix_rbind(&m2, &m);
print_matrix(&m2);
printf("\n");
igraph_matrix_rbind(&m, &m2);
print_matrix(&m);
/* igraph_matrix_cbind */
printf("igraph_matrix_cbind\n");
igraph_matrix_resize(&m, 4, 3);
igraph_matrix_resize(&m2, 4, 2);
byrow(&m);
byrow(&m2);
igraph_matrix_cbind(&m, &m2);
print_matrix(&m);
/* igraph_matrix_swap */
printf("igraph_matrix_swap\n");
igraph_matrix_update(&m, &m2);
igraph_matrix_null(&m);
igraph_matrix_swap(&m, &m2);
print_matrix(&m);
print_matrix(&m2);
/* igraph_matrix_get_row */
/* igraph_matrix_set_row */
printf("igraph_matrix_get_row\n");
printf("igraph_matrix_set_row\n");
igraph_vector_init(&v, 0);
for (i=0; i<igraph_matrix_nrow(&m); i++) {
igraph_matrix_get_row(&m, &v, i);
igraph_matrix_set_row(&m2, &v, i);
}
print_matrix(&m2);
/* igraph_matrix_set_col */
printf("igraph_matrix_set_col\n");
igraph_matrix_null(&m2);
for (i=0; i<igraph_matrix_ncol(&m); i++) {
igraph_matrix_get_col(&m, &v, i);
igraph_matrix_set_col(&m2, &v, i);
}
print_matrix(&m2);
/* igraph_matrix_swap_rows */
printf("igraph_matrix_swap_rows\n");
igraph_matrix_swap_rows(&m2, 0, 0);
igraph_matrix_swap_rows(&m2, 0, 2);
print_matrix(&m2);
/* igraph_matrix_swap_cols */
printf("igraph_matrix_swap_cols\n");
igraph_matrix_swap_cols(&m2, 0, 0);
igraph_matrix_swap_cols(&m2, 0, 1);
print_matrix(&m2);
/* igraph_matrix_add_constant */
printf("igraph_matrix_add_constant\n");
igraph_matrix_add_constant(&m2, 0);
print_matrix(&m2);
igraph_matrix_add_constant(&m2, -1);
print_matrix(&m2);
/* igraph_matrix_add */
printf("igraph_matrix_add\n");
byrow(&m2);
byrow(&m);
igraph_matrix_add(&m2, &m);
print_matrix(&m2);
/* igraph_matrix_sub */
printf("igraph_matrix_sub\n");
igraph_matrix_sub(&m2, &m);
print_matrix(&m2);
/* igraph_matrix_mul_elements */
printf("igraph_matrix_mul_elements\n");
igraph_matrix_mul_elements(&m2, &m);
print_matrix(&m2);
/* igraph_matrix_div_elements */
printf("igraph_matrix_div_elements\n");
igraph_matrix_fill(&m, 2);
igraph_matrix_div_elements(&m2, &m);
print_matrix(&m2);
/* igraph_matrix_min */
printf("igraph_matrix_min\n");
if (igraph_matrix_min(&m2) != 0) {
return 1;
}
if (igraph_matrix_min(&m) != 2) {
return 1;
}
/* igraph_matrix_which_min */
printf("igraph_matrix_which_min\n");
igraph_matrix_which_min(&m2, &i, &j);
if (i != 0 || j != 0) { return 2; }
MATRIX(m2,0,1) = -1;
igraph_matrix_which_min(&m2, &i, &j);
if (i != 0 || j != 1) { return 2; }
MATRIX(m2,3,1) = -2;
igraph_matrix_which_min(&m2, &i, &j);
if (i != 3 || j != 1) { return 2; }
/* igraph_matrix_which_max */
printf("igraph_matrix_which_max\n");
MATRIX(m2,3,0) = 100;
igraph_matrix_which_max(&m2, &i, &j);
if (i != 3 || j != 0) { return 3; }
/* igraph_matrix_minmax */
printf("igraph_matrix_minmax\n");
igraph_matrix_minmax(&m2, &r1, &r2);
printf("%g %g\n", r1, r2);
/* igraph_matrix_which_minmax */
printf("igraph_matrix_which_minmax\n");
igraph_matrix_which_minmax(&m2, &i, &j, &i2, &j2);
if (i != 3 || j != 1 || i2 != 3 || j2 != 0) { return 4; }
/* igraph_matrix_isnull */
printf("igraph_matrix_isnull\n");
if (igraph_matrix_isnull(&m2)) { return 5; }
igraph_matrix_null(&m);
if (!igraph_matrix_isnull(&m)) { return 5; }
igraph_matrix_resize(&m2, 5, 0);
if (!igraph_matrix_isnull(&m2)) { return 5; }
/* igraph_matrix_empty */
printf("igraph_matrix_empty\n");
if (!igraph_matrix_empty(&m2)) { return 6; }
igraph_matrix_resize(&m2, 5, 5);
if (igraph_matrix_empty(&m2)) { return 6; }
/* igraph_matrix_is_symmetric */
printf("igraph_matrix_is_symmetric\n");
byrow(&m2);
if (igraph_matrix_is_symmetric(&m2)) { return 7; }
igraph_matrix_update(&m, &m2);
igraph_matrix_transpose(&m);
igraph_matrix_add(&m, &m2);
if (!igraph_matrix_is_symmetric(&m)) { return 7; }
/* igraph_matrix_prod */
printf("igraph_matrix_prod\n");
igraph_matrix_resize(&m, 3,2);
byrow(&m);
igraph_matrix_add_constant(&m, 1);
print_matrix(&m);
printf("product: %g\n", igraph_matrix_prod(&m));
/* igraph_matrix_rowsum */
printf("igraph_matrix_rowsum\n");
igraph_matrix_rowsum(&m, &v);
print_vector(&v);
/* igraph_matrix_colsum */
printf("igraph_matrix_colsum\n");
igraph_matrix_colsum(&m, &v);
print_vector(&v);
/* igraph_matrix_contains */
printf("igraph_matrix_contains\n");
if (igraph_matrix_contains(&m, 0)) { return 8; }
if (igraph_matrix_contains(&m, 6.0001)) { return 8; }
if (igraph_matrix_contains(&m, 7)) { return 8; }
if (!igraph_matrix_contains(&m, 1)) { return 8; }
if (!igraph_matrix_contains(&m, 6)) { return 8; }
/* igraph_matrix_search */
printf("igraph_matrix_search\n");
if (!igraph_matrix_search(&m, 0, 6.0, &i2, &i, &j)) { return 9; }
if (i2 != 5 || i != 2 || j != 1) { return 9; }
/* igraph_matrix_remove_row */
printf("igraph_matrix_remove_row\n");
igraph_matrix_remove_row(&m, 1);
print_matrix(&m);
igraph_matrix_resize(&m,5,4);
byrow(&m);
igraph_matrix_remove_row(&m, 4);
print_matrix(&m);
igraph_matrix_remove_row(&m, 0);
print_matrix(&m);
/* igraph_matrix_select_cols */
printf("igraph_matrix_select_cols\n");
igraph_matrix_resize(&m, 6, 5);
apply(m, igraph_matrix_set(&m, i, j, j), (void) 0 );
igraph_vector_resize(&v, 3);
VECTOR(v)[0]=0; VECTOR(v)[1]=4; VECTOR(v)[2]=2;
igraph_matrix_select_cols(&m, &m2, &v);
print_matrix(&m2);
igraph_vector_resize(&v, 1);
igraph_matrix_select_cols(&m, &m2, &v);
print_matrix(&m2);
igraph_vector_clear(&v);
igraph_matrix_select_cols(&m, &m2, &v);
if (!igraph_matrix_empty(&m2)) { return 9; }
igraph_vector_destroy(&v);
igraph_matrix_destroy(&m2);
igraph_matrix_destroy(&m);
if (IGRAPH_FINALLY_STACK_SIZE() != 0) return 10;
return 0;
}
/* Random Orders Method :
*/
igraph_t * ggen_generate_random_orders(gsl_rng *r, unsigned long n, unsigned int orders)
{
igraph_t *g = NULL;
igraph_matrix_t m,edge_validity;
int err = 0;
long long i = 0,j,k;
igraph_vector_ptr_t posets;
igraph_vector_ptr_t indexes;
igraph_vector_t *v,*w;
ggen_error_start_stack();
if(r == NULL)
GGEN_SET_ERRNO(GGEN_EINVAL);
if(orders == 0)
GGEN_SET_ERRNO(GGEN_EINVAL);
// init structures
g = malloc(sizeof(igraph_t));
GGEN_CHECK_ALLOC(g);
GGEN_FINALLY3(free,g,1);
GGEN_CHECK_IGRAPH(igraph_matrix_init(&m,n,n));
GGEN_FINALLY(igraph_matrix_destroy,&m);
GGEN_CHECK_IGRAPH(igraph_matrix_init(&edge_validity,n,n));
GGEN_FINALLY(igraph_matrix_destroy,&edge_validity);
GGEN_CHECK_IGRAPH(igraph_vector_ptr_init(&posets,orders));
IGRAPH_VECTOR_PTR_SET_ITEM_DESTRUCTOR(&posets,igraph_vector_destroy);
GGEN_FINALLY(igraph_vector_ptr_destroy_all,&posets);
GGEN_CHECK_IGRAPH(igraph_vector_ptr_init(&indexes,orders));
IGRAPH_VECTOR_PTR_SET_ITEM_DESTRUCTOR(&indexes,igraph_vector_destroy);
GGEN_FINALLY(igraph_vector_ptr_destroy_all,&indexes);
for(i = 0; i < orders; i++)
{
// posets is used for permutation computations
// it should contain vertices
VECTOR(posets)[i] = calloc(1,sizeof(igraph_vector_t));
GGEN_CHECK_ALLOC(VECTOR(posets)[i]);
GGEN_CHECK_IGRAPH_VECTPTR(igraph_vector_init_seq(VECTOR(posets)[i],0,n-1),posets,i);
VECTOR(indexes)[i] = calloc(1,sizeof(igraph_vector_t));
GGEN_CHECK_ALLOC(VECTOR(indexes)[i]);
GGEN_CHECK_IGRAPH_VECTPTR(igraph_vector_init(VECTOR(indexes)[i],n),indexes,i);
}
// zero all structs
igraph_matrix_null(&m);
igraph_matrix_null(&edge_validity);
// use gsl to shuffle each poset
for( j = 0; j < orders; j++)
{
v = VECTOR(posets)[j];
GGEN_CHECK_GSL_DO(gsl_ran_shuffle(r,VECTOR(*v), n, sizeof(VECTOR(*v)[0])));
}
// index saves the indices of each vertex in each permutation
for( i = 0; i < orders; i++)
for( j = 0; j < n; j++)
{
v = VECTOR(posets)[i];
w = VECTOR(indexes)[i];
k = VECTOR(*v)[j];
VECTOR(*w)[k] = j;
}
// edge_validity count if an edge is in all permutations
for( i = 0; i < n; i++)
for( j = 0; j < n; j++)
for( k = 0; k < orders; k++)
{
v = VECTOR(indexes)[k];
if( VECTOR(*v)[i] < VECTOR(*v)[j])
igraph_matrix_set(&edge_validity,i,j,
igraph_matrix_e(&edge_validity,i,j)+1);
}
// if an edge is present in all permutations then add it to the graph
for( i = 0; i < n; i++)
for( j = 0; j < n; j++)
if(igraph_matrix_e(&edge_validity,i,j) == orders)
igraph_matrix_set(&m,i,j,1);
// translate the matrix to a graph
GGEN_CHECK_IGRAPH(igraph_adjacency(g,&m,IGRAPH_ADJ_DIRECTED));
ggen_error_clean(1);
return g;
ggen_error_label:
return NULL;
}
int main(int argc, char* argv[]) {
//Open files for read / write
FILE *ifile;
FILE *ofile;
//Open the source file stream
ifile=fopen(argv[1], "r");
//Check if file is opened
if (!ifile) {
printf("Invalid input file!\n");
return 1;
}
//Open target file
ofile = fopen(argv[2], "w");
//Safety check.
if(!ofile){
printf("Cannot create output file!\n");
return 1;
}
//Make the igraph object
igraph_t g;
//Read the file having pure edge list
igraph_read_graph_edgelist(&g, ifile, 0, 0);
//File read, close it!
fclose(ifile);
//Create a matrix which will hold positions
igraph_matrix_t coords;
igraph_matrix_init(&coords, 0, 0);
//Store the vertex counts
igraph_real_t vc = igraph_vcount(&g);
//Do the layout
igraph_layout_lgl(&g, &coords,
/* maxiter */ 150,
/* maxdelta */ vc,
/* area */ vc*vc,
/* coolexp */ 1.5,
/* repulserad */ vc*vc*vc,
/* cellsize */ sqrt(sqrt(vc)),
/* root */ 0);
//Lets see some stats
long int numEl = igraph_matrix_size(&coords);
long int numRow = igraph_matrix_nrow(&coords);
long int numCol = igraph_matrix_ncol(&coords);
printf("Vertices: %d , Edges: %d\n", igraph_vcount(&g), igraph_ecount(&g));
printf("Total: %ld | [rows: %ld , cols: %ld]\n", numEl, numRow, numCol);
fprintf(ofile, "[");
for(int i = 0; i < numRow; i++){
if(i != 0) fprintf(ofile, ",\n");
fprintf(ofile, "{ \"ref\": %d, \"x\": %f, \"y\": %f}", i, (double)igraph_matrix_e(&coords,i,0), (double)igraph_matrix_e(&coords,i,1));
}
fprintf(ofile, "]");
fclose(ofile);
igraph_matrix_destroy(&coords);
igraph_destroy(&g);
return 0;
}